I have an HP Pavilion 740n with a pentium 4 1.6ghz cpu, 2 x 256mb RAM (max RAM is 2gig) and onboard graphics.
My problem is I wanted to upgrade the video card and RAM so I bought a card and a 512mb stick. I took out the 2 256mb sticks and added 2 512mb before putting the fx card in. Now when I power on the comp it starts but makes a loud beep for a few seconds, stops then does it again, no picture on the monitor either.
I tried putting the 256mb sticks in and the same thing happens. Also there was an AGP card in the machine but not installed. Before sticking that in there I was having the same problems with the loud beep but could eventually get to the BIOS. Having the video card seemed to help even though it wasn't installed, comp always started correctly and never crashed.
I even tried all possible combinations including the new card and taking both out. Now when I power on the comp it starts but makes a loud beep for a few seconds, stops then does it again, no picture on the monitor either.
I hope someone can help, if you need more specs I will have to look them up because I forgot. Thanks in advance.